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https://issues.apache.org/jira/browse/FLINK-21863?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Metzger updated FLINK-21863:
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Component/s: API / DataSet
> SortPartition should allow chaining of KeySelectors to support different
> sorting orders for the fields
> ------------------------------------------------------------------------------------------------------
>
> Key: FLINK-21863
> URL: https://issues.apache.org/jira/browse/FLINK-21863
> Project: Flink
> Issue Type: Improvement
> Components: API / DataSet
> Reporter: Etienne Chauchot
> Priority: Major
>
> If we need to sort data in a DataSet using a KeySelector (for example to
> extract avro fields or when sort using field index or name is not available)
> we cannot have different sort orders for the fields. We can sort by a list of
> fields by making the keySelector return a tuple but they will all be sorted
> in the same order.
> To allow _sort by field 1 ASC, field 2 DESC_ kind of semantics with
> KeySelectors we need to be able to chain the KeySelectors like this
> {code:java}
> DataSet.sortPartition(field1KeySelector , Order.ASCENDING)
> .sortPartition(field2KeySelector, Order.DESCENDING)
> {code}
> which is currently not possible.
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